.TH "QwtPicker" 3 "Fri Apr 15 2011" "Version 6.0.0" "Qwt User's Guide" \" -*- nroff -*-
.ad l
.nh
.SH NAME
QwtPicker \- 
.PP
\fBQwtPicker\fP provides selections on a widget.  

.SH SYNOPSIS
.br
.PP
.PP
\fC#include <qwt_picker.h>\fP
.PP
Inherits \fBQwtEventPattern\fP.
.PP
Inherited by \fBQwtPlotPicker\fP.
.SS "Public Types"

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.RI "enum \fBRubberBand\fP { \fBNoRubberBand\fP =  0, \fBHLineRubberBand\fP, \fBVLineRubberBand\fP, \fBCrossRubberBand\fP, \fBRectRubberBand\fP, \fBEllipseRubberBand\fP, \fBPolygonRubberBand\fP, \fBUserRubberBand\fP =  100 }"
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.RI "enum \fBDisplayMode\fP { \fBAlwaysOff\fP, \fBAlwaysOn\fP, \fBActiveOnly\fP }"
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.RI "enum \fBResizeMode\fP { \fBStretch\fP, \fBKeepSize\fP }"
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.SS "Public Slots"

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.RI "void \fBsetEnabled\fP (bool)"
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.SS "Signals"

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.RI "void \fBactivated\fP (bool on)"
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.RI "void \fBselected\fP (const QPolygon &polygon)"
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.RI "void \fBappended\fP (const QPoint &pos)"
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.RI "void \fBmoved\fP (const QPoint &pos)"
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.RI "void \fBremoved\fP (const QPoint &pos)"
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.RI "void \fBchanged\fP (const QPolygon &selection)"
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.SS "Public Member Functions"

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.RI "\fBQwtPicker\fP (QWidget *parent)"
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.RI "\fBQwtPicker\fP (\fBRubberBand\fP rubberBand, \fBDisplayMode\fP trackerMode, QWidget *)"
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.RI "virtual \fB~QwtPicker\fP ()"
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.RI "void \fBsetStateMachine\fP (\fBQwtPickerMachine\fP *)"
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.RI "const \fBQwtPickerMachine\fP * \fBstateMachine\fP () const "
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.RI "\fBQwtPickerMachine\fP * \fBstateMachine\fP ()"
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.RI "void \fBsetRubberBand\fP (\fBRubberBand\fP)"
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.RI "\fBRubberBand\fP \fBrubberBand\fP () const "
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.RI "void \fBsetTrackerMode\fP (\fBDisplayMode\fP)"
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.RI "\fBDisplayMode\fP \fBtrackerMode\fP () const "
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.RI "void \fBsetResizeMode\fP (\fBResizeMode\fP)"
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.RI "\fBResizeMode\fP \fBresizeMode\fP () const "
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.RI "void \fBsetRubberBandPen\fP (const QPen &)"
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.RI "QPen \fBrubberBandPen\fP () const "
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.RI "void \fBsetTrackerPen\fP (const QPen &)"
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.RI "QPen \fBtrackerPen\fP () const "
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.RI "void \fBsetTrackerFont\fP (const QFont &)"
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.RI "QFont \fBtrackerFont\fP () const "
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.RI "bool \fBisEnabled\fP () const "
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.RI "bool \fBisActive\fP () const "
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.RI "virtual bool \fBeventFilter\fP (QObject *, QEvent *)"
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.RI "QWidget * \fBparentWidget\fP ()"
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.RI "const QWidget * \fBparentWidget\fP () const "
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.RI "virtual QRect \fBpickRect\fP () const "
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.RI "virtual void \fBdrawRubberBand\fP (QPainter *) const "
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.RI "virtual void \fBdrawTracker\fP (QPainter *) const "
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.RI "virtual \fBQwtText\fP \fBtrackerText\fP (const QPoint &pos) const "
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.RI "QPoint \fBtrackerPosition\fP () const "
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.RI "virtual QRect \fBtrackerRect\fP (const QFont &) const "
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.RI "QPolygon \fBselection\fP () const "
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.SS "Protected Member Functions"

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.RI "virtual QPolygon \fBadjustedPoints\fP (const QPolygon &) const "
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.RI "virtual void \fBtransition\fP (const QEvent *)"
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.RI "virtual void \fBbegin\fP ()"
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.RI "virtual void \fBappend\fP (const QPoint &)"
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.RI "virtual void \fBmove\fP (const QPoint &)"
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.RI "virtual void \fBremove\fP ()"
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.RI "virtual bool \fBend\fP (bool ok=true)"
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.RI "virtual bool \fBaccept\fP (QPolygon &) const "
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.RI "virtual void \fBreset\fP ()"
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.RI "virtual void \fBwidgetMousePressEvent\fP (QMouseEvent *)"
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.RI "virtual void \fBwidgetMouseReleaseEvent\fP (QMouseEvent *)"
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.RI "virtual void \fBwidgetMouseDoubleClickEvent\fP (QMouseEvent *)"
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.RI "virtual void \fBwidgetMouseMoveEvent\fP (QMouseEvent *)"
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.RI "virtual void \fBwidgetWheelEvent\fP (QWheelEvent *)"
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.RI "virtual void \fBwidgetKeyPressEvent\fP (QKeyEvent *)"
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.RI "virtual void \fBwidgetKeyReleaseEvent\fP (QKeyEvent *)"
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.RI "virtual void \fBwidgetEnterEvent\fP (QEvent *)"
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.RI "virtual void \fBwidgetLeaveEvent\fP (QEvent *)"
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.RI "virtual void \fBstretchSelection\fP (const QSize &oldSize, const QSize &newSize)"
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.RI "virtual void \fBupdateDisplay\fP ()"
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.RI "const QWidget * \fBrubberBandWidget\fP () const "
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.RI "const QWidget * \fBtrackerWidget\fP () const "
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.RI "const QPolygon & \fBpickedPoints\fP () const "
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.SH "Detailed Description"
.PP 
\fBQwtPicker\fP provides selections on a widget. 

\fBQwtPicker\fP filters all enter, leave, mouse and keyboard events of a widget and translates them into an array of selected points.
.PP
The way how the points are collected depends on type of state machine that is connected to the picker. Qwt offers a couple of predefined state machines for selecting:
.PP
.IP "\(bu" 2
Nothing
.br
 \fBQwtPickerTrackerMachine\fP
.IP "\(bu" 2
Single points
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 \fBQwtPickerClickPointMachine\fP, \fBQwtPickerDragPointMachine\fP
.IP "\(bu" 2
Rectangles
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 \fBQwtPickerClickRectMachine\fP, \fBQwtPickerDragRectMachine\fP
.IP "\(bu" 2
Polygons
.br
 \fBQwtPickerPolygonMachine\fP
.PP
.PP
While these state machines cover the most common ways to collect points it is also possible to implement individual machines as well.
.PP
\fBQwtPicker\fP translates the picked points into a selection using the adjustedPoints method. adjustedPoints is intended to be reimplemented to fixup the selection according to application specific requirements. (F.e. when an application accepts rectangles of a fixed aspect ratio only.)
.PP
Optionally \fBQwtPicker\fP support the process of collecting points by a rubberband and tracker displaying a text for the current mouse position.
.PP
\fBExample\fP
.RS 4

.PP
.nf
#include <qwt_picker.h>
#include <qwt_picker_machine.h>

QwtPicker *picker = new QwtPicker(widget);
picker->setStateMachine(new QwtPickerDragRectMachine);
picker->setTrackerMode(QwtPicker::ActiveOnly);
picker->setRubberBand(QwtPicker::RectRubberBand); 
.fi
.PP

.br
.RE
.PP
The state machine triggers the following commands:
.PP
.IP "\(bu" 2
\fBbegin()\fP
.br
 Activate/Initialize the selection.
.IP "\(bu" 2
\fBappend()\fP
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 Add a new point
.IP "\(bu" 2
\fBmove()\fP 
.br
 Change the position of the last point.
.IP "\(bu" 2
\fBremove()\fP
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 Remove the last point.
.IP "\(bu" 2
\fBend()\fP
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 Terminate the selection and call accept to validate the picked points.
.PP
.PP
The picker is active (\fBisActive()\fP), between \fBbegin()\fP and \fBend()\fP. In active state the rubberband is displayed, and the tracker is visible in case of trackerMode is ActiveOnly or AlwaysOn.
.PP
The cursor can be moved using the arrow keys. All selections can be aborted using the abort key. (\fBQwtEventPattern::KeyPatternCode\fP)
.PP
\fBWarning:\fP
.RS 4
In case of QWidget::NoFocus the focus policy of the observed widget is set to QWidget::WheelFocus and mouse tracking will be manipulated while the picker is active, or if \fBtrackerMode()\fP is AlwayOn. 
.RE
.PP

.SH "Member Enumeration Documentation"
.PP 
.SS "enum \fBQwtPicker::DisplayMode\fP"
.PP
Display mode. \fBSee also:\fP
.RS 4
\fBsetTrackerMode()\fP, \fBtrackerMode()\fP, \fBisActive()\fP 
.RE
.PP

.PP
\fBEnumerator: \fP
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.TP
\fB\fIAlwaysOff \fP\fP
Display never. 
.TP
\fB\fIAlwaysOn \fP\fP
Display always. 
.TP
\fB\fIActiveOnly \fP\fP
Display only when the selection is active. 
.SS "enum \fBQwtPicker::ResizeMode\fP"Controls what to do with the selected points of an active selection when the observed widget is resized.
.PP
The default value is \fBQwtPicker::Stretch\fP. 
.PP
\fBSee also:\fP
.RS 4
\fBsetResizeMode()\fP 
.RE
.PP

.PP
\fBEnumerator: \fP
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.TP
\fB\fIStretch \fP\fP
All points are scaled according to the new size,. 
.TP
\fB\fIKeepSize \fP\fP
All points remain unchanged. 
.SS "enum \fBQwtPicker::RubberBand\fP"Rubberband style
.PP
The default value is \fBQwtPicker::NoRubberBand\fP. 
.PP
\fBSee also:\fP
.RS 4
\fBsetRubberBand()\fP, \fBrubberBand()\fP 
.RE
.PP

.PP
\fBEnumerator: \fP
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.TP
\fB\fINoRubberBand \fP\fP
No rubberband. 
.TP
\fB\fIHLineRubberBand \fP\fP
A horizontal line ( only for QwtPicker::PointSelection ) 
.TP
\fB\fIVLineRubberBand \fP\fP
A vertical line ( only for QwtPicker::PointSelection ) 
.TP
\fB\fICrossRubberBand \fP\fP
A crosshair ( only for QwtPicker::PointSelection ) 
.TP
\fB\fIRectRubberBand \fP\fP
A rectangle ( only for QwtPicker::RectSelection ) 
.TP
\fB\fIEllipseRubberBand \fP\fP
An ellipse ( only for QwtPicker::RectSelection ) 
.TP
\fB\fIPolygonRubberBand \fP\fP
A polygon ( only for \fBQwtPicker\fP::&PolygonSelection ) 
.TP
\fB\fIUserRubberBand \fP\fP
Values >= UserRubberBand can be used to define additional rubber bands. 
.SH "Constructor & Destructor Documentation"
.PP 
.SS "QwtPicker::QwtPicker (QWidget *parent)\fC [explicit]\fP"Constructor
.PP
Creates an picker that is enabled, but without a state machine. rubberband and tracker are disabled.
.PP
\fBParameters:\fP
.RS 4
\fIparent\fP Parent widget, that will be observed 
.RE
.PP

.SS "QwtPicker::QwtPicker (\fBRubberBand\fPrubberBand, \fBDisplayMode\fPtrackerMode, QWidget *parent)\fC [explicit]\fP"Constructor
.PP
\fBParameters:\fP
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\fIrubberBand\fP Rubberband style 
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\fItrackerMode\fP Tracker mode 
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\fIparent\fP Parent widget, that will be observed 
.RE
.PP

.SS "QwtPicker::~QwtPicker ()\fC [virtual]\fP"
.PP
Destructor. 
.SH "Member Function Documentation"
.PP 
.SS "bool QwtPicker::accept (QPolygon &selection) const\fC [protected, virtual]\fP"
.PP
Validate and fixup the selection. Accepts all selections unmodified
.PP
\fBParameters:\fP
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\fIselection\fP Selection to validate and fixup 
.RE
.PP
\fBReturns:\fP
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true, when accepted, false otherwise 
.RE
.PP

.PP
Reimplemented in \fBQwtPlotZoomer\fP.
.SS "void QwtPicker::activated (boolon)\fC [signal]\fP"A signal indicating, when the picker has been activated. Together with \fBsetEnabled()\fP it can be used to implement selections with more than one picker.
.PP
\fBParameters:\fP
.RS 4
\fIon\fP True, when the picker has been activated 
.RE
.PP

.SS "QPolygon QwtPicker::adjustedPoints (const QPolygon &points) const\fC [protected, virtual]\fP"
.PP
Map the \fBpickedPoints()\fP into a \fBselection()\fP \fBadjustedPoints()\fP maps the points, that have been collected on the \fBparentWidget()\fP into a \fBselection()\fP. The default implementation simply returns the points unmodified.
.PP
The reason, why a \fBselection()\fP differs from the picked points depends on the application requirements. F.e. :
.PP
.IP "\(bu" 2
A rectangular selection might need to have a specific aspect ratio only.
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.IP "\(bu" 2
A selection could accept non intersecting polygons only.
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.IP "\(bu" 2
...
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.PP
.PP
The example below is for a rectangular selection, where the first point is the center of the selected rectangle. 
.PP
\fBExample\fP
.RS 4

.PP
.nf
QPolygon MyPicker::adjustedPoints(const QPolygon &points) const
{
    QPolygon adjusted;
    if ( points.size() == 2 )
    {
        const int width = qAbs(points[1].x() - points[0].x());
        const int height = qAbs(points[1].y() - points[0].y());

        QRect rect(0, 0, 2 * width, 2 * height);
        rect.moveCenter(points[0]);

        adjusted += rect.topLeft();
        adjusted += rect.bottomRight();
    }
    return adjusted;
}
.fi
.PP

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.RE
.PP

.SS "void QwtPicker::append (const QPoint &pos)\fC [protected, virtual]\fP"Append a point to the selection and update rubberband and tracker. The \fBappended()\fP signal is emitted.
.PP
\fBParameters:\fP
.RS 4
\fIpos\fP Additional point
.RE
.PP
\fBSee also:\fP
.RS 4
\fBisActive()\fP, \fBbegin()\fP, \fBend()\fP, \fBmove()\fP, \fBappended()\fP 
.RE
.PP

.PP
Reimplemented in \fBQwtPlotPicker\fP.
.SS "void QwtPicker::appended (const QPoint &pos)\fC [signal]\fP"A signal emitted when a point has been appended to the selection
.PP
\fBParameters:\fP
.RS 4
\fIpos\fP Position of the appended point. 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBappend()\fP. \fBmoved()\fP 
.RE
.PP

.SS "void QwtPicker::begin ()\fC [protected, virtual]\fP"Open a selection setting the state to active
.PP
\fBSee also:\fP
.RS 4
\fBisActive()\fP, \fBend()\fP, \fBappend()\fP, \fBmove()\fP 
.RE
.PP

.PP
Reimplemented in \fBQwtPlotZoomer\fP.
.SS "void QwtPicker::changed (const QPolygon &selection)\fC [signal]\fP"A signal emitted when the active selection has been changed. This might happen when the observed widget is resized.
.PP
\fBParameters:\fP
.RS 4
\fIselection\fP Changed selection 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBstretchSelection()\fP 
.RE
.PP

.SS "void QwtPicker::drawRubberBand (QPainter *painter) const\fC [virtual]\fP"Draw a rubberband, depending on \fBrubberBand()\fP
.PP
\fBParameters:\fP
.RS 4
\fIpainter\fP Painter, initialized with clip rect
.RE
.PP
\fBSee also:\fP
.RS 4
\fBrubberBand()\fP, \fBRubberBand\fP 
.RE
.PP

.SS "void QwtPicker::drawTracker (QPainter *painter) const\fC [virtual]\fP"Draw the tracker
.PP
\fBParameters:\fP
.RS 4
\fIpainter\fP Painter 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBtrackerRect()\fP, \fBtrackerText()\fP 
.RE
.PP

.SS "bool QwtPicker::end (boolok = \fCtrue\fP)\fC [protected, virtual]\fP"
.PP
Close a selection setting the state to inactive. The selection is validated and maybe fixed by \fBaccept()\fP.
.PP
\fBParameters:\fP
.RS 4
\fIok\fP If true, complete the selection and emit a selected signal otherwise discard the selection. 
.RE
.PP
\fBReturns:\fP
.RS 4
true if the selection is accepted, false otherwise 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBisActive()\fP, \fBbegin()\fP, \fBappend()\fP, \fBmove()\fP, \fBselected()\fP, \fBaccept()\fP 
.RE
.PP

.PP
Reimplemented in \fBQwtPlotPicker\fP, and \fBQwtPlotZoomer\fP.
.SS "bool QwtPicker::eventFilter (QObject *o, QEvent *e)\fC [virtual]\fP"
.PP
Event filter. When \fBisEnabled()\fP == true all events of the observed widget are filtered. Mouse and keyboard events are translated into widgetMouse- and widgetKey- and widgetWheel-events. Paint and Resize events are handled to keep rubberband and tracker up to date.
.PP
\fBSee also:\fP
.RS 4
event(), \fBwidgetEnterEvent()\fP, \fBwidgetLeaveEvent()\fP, \fBwidgetMousePressEvent()\fP, \fBwidgetMouseReleaseEvent()\fP, \fBwidgetMouseDoubleClickEvent()\fP, \fBwidgetMouseMoveEvent()\fP, \fBwidgetWheelEvent()\fP, \fBwidgetKeyPressEvent()\fP, \fBwidgetKeyReleaseEvent()\fP 
.RE
.PP

.SS "bool QwtPicker::isActive () const"A picker is active between \fBbegin()\fP and \fBend()\fP. 
.PP
\fBReturns:\fP
.RS 4
true if the selection is active. 
.RE
.PP

.SS "bool QwtPicker::isEnabled () const"\fBReturns:\fP
.RS 4
true when enabled, false otherwise 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetEnabled()\fP, \fBeventFilter()\fP 
.RE
.PP

.SS "void QwtPicker::move (const QPoint &pos)\fC [protected, virtual]\fP"Move the last point of the selection The \fBmoved()\fP signal is emitted.
.PP
\fBParameters:\fP
.RS 4
\fIpos\fP New position 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBisActive()\fP, \fBbegin()\fP, \fBend()\fP, \fBappend()\fP 
.RE
.PP

.PP
Reimplemented in \fBQwtPlotPicker\fP.
.SS "void QwtPicker::moved (const QPoint &pos)\fC [signal]\fP"A signal emitted whenever the last appended point of the selection has been moved.
.PP
\fBParameters:\fP
.RS 4
\fIpos\fP Position of the moved last point of the selection. 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBmove()\fP, \fBappended()\fP 
.RE
.PP

.SS "QWidget * QwtPicker::parentWidget ()"
.PP
Return the parent widget, where the selection happens. 
.SS "const QWidget * QwtPicker::parentWidget () const"
.PP
Return the parent widget, where the selection happens. 
.SS "const QPolygon & QwtPicker::pickedPoints () const\fC [protected]\fP"Return the points, that have been collected so far. The \fBselection()\fP is calculated from the \fBpickedPoints()\fP in \fBadjustedPoints()\fP. 
.PP
\fBReturns:\fP
.RS 4
Picked points 
.RE
.PP

.SS "QRect QwtPicker::pickRect () const\fC [virtual]\fP"Find the area of the observed widget, where selection might happen.
.PP
\fBReturns:\fP
.RS 4
QFrame::contentsRect() if it is a QFrame, QWidget::rect() otherwise. 
.RE
.PP

.SS "void QwtPicker::remove ()\fC [protected, virtual]\fP"Remove the last point of the selection The \fBremoved()\fP signal is emitted.
.PP
\fBSee also:\fP
.RS 4
\fBisActive()\fP, \fBbegin()\fP, \fBend()\fP, \fBappend()\fP, \fBmove()\fP 
.RE
.PP

.SS "void QwtPicker::removed (const QPoint &pos)\fC [signal]\fP"A signal emitted whenever the last appended point of the selection has been removed.
.PP
\fBSee also:\fP
.RS 4
\fBremove()\fP, \fBappended()\fP 
.RE
.PP

.SS "void QwtPicker::reset ()\fC [protected, virtual]\fP"Reset the state machine and terminate (end(false)) the selection 
.SS "\fBQwtPicker::ResizeMode\fP QwtPicker::resizeMode () const"\fBReturns:\fP
.RS 4
Resize mode 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetResizeMode()\fP, \fBResizeMode\fP 
.RE
.PP

.SS "\fBQwtPicker::RubberBand\fP QwtPicker::rubberBand () const"\fBReturns:\fP
.RS 4
Rubberband style 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetRubberBand()\fP, \fBRubberBand\fP, \fBrubberBandPen()\fP 
.RE
.PP

.SS "QPen QwtPicker::rubberBandPen () const"\fBReturns:\fP
.RS 4
Rubberband pen 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetRubberBandPen()\fP, \fBrubberBand()\fP 
.RE
.PP

.SS "const QWidget * QwtPicker::rubberBandWidget () const\fC [protected]\fP"\fBReturns:\fP
.RS 4
Widget displaying the rubberband 
.RE
.PP

.SS "void QwtPicker::selected (const QPolygon &polygon)\fC [signal]\fP"A signal emitting the selected points, at the end of a selection.
.PP
\fBParameters:\fP
.RS 4
\fIpolygon\fP Selected points 
.RE
.PP

.SS "QPolygon QwtPicker::selection () const"\fBReturns:\fP
.RS 4
Selected points 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBpickedPoints()\fP, \fBadjustedPoints()\fP 
.RE
.PP

.SS "void QwtPicker::setEnabled (boolenabled)\fC [slot]\fP"
.PP
En/disable the picker. When enabled is true an event filter is installed for the observed widget, otherwise the event filter is removed.
.PP
\fBParameters:\fP
.RS 4
\fIenabled\fP true or false 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBisEnabled()\fP, \fBeventFilter()\fP 
.RE
.PP

.SS "void QwtPicker::setResizeMode (\fBResizeMode\fPmode)"
.PP
Set the resize mode. The resize mode controls what to do with the selected points of an active selection when the observed widget is resized.
.PP
Stretch means the points are scaled according to the new size, KeepSize means the points remain unchanged.
.PP
The default mode is Stretch.
.PP
\fBParameters:\fP
.RS 4
\fImode\fP Resize mode 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBresizeMode()\fP, \fBResizeMode\fP 
.RE
.PP

.SS "void QwtPicker::setRubberBand (\fBRubberBand\fPrubberBand)"Set the rubberband style
.PP
\fBParameters:\fP
.RS 4
\fIrubberBand\fP Rubberband style The default value is NoRubberBand.
.RE
.PP
\fBSee also:\fP
.RS 4
\fBrubberBand()\fP, \fBRubberBand\fP, \fBsetRubberBandPen()\fP 
.RE
.PP

.SS "void QwtPicker::setRubberBandPen (const QPen &pen)"Set the pen for the rubberband
.PP
\fBParameters:\fP
.RS 4
\fIpen\fP Rubberband pen 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBrubberBandPen()\fP, \fBsetRubberBand()\fP 
.RE
.PP

.SS "void QwtPicker::setStateMachine (\fBQwtPickerMachine\fP *stateMachine)"Set a state machine and delete the previous one
.PP
\fBParameters:\fP
.RS 4
\fIstateMachine\fP State machine 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBstateMachine()\fP 
.RE
.PP

.SS "void QwtPicker::setTrackerFont (const QFont &font)"Set the font for the tracker
.PP
\fBParameters:\fP
.RS 4
\fIfont\fP Tracker font 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBtrackerFont()\fP, \fBsetTrackerMode()\fP, \fBsetTrackerPen()\fP 
.RE
.PP

.SS "void QwtPicker::setTrackerMode (\fBDisplayMode\fPmode)"
.PP
Set the display mode of the tracker. A tracker displays information about current position of the cursor as a string. The display mode controls if the tracker has to be displayed whenever the observed widget has focus and cursor (AlwaysOn), never (AlwaysOff), or only when the selection is active (ActiveOnly).
.PP
\fBParameters:\fP
.RS 4
\fImode\fP Tracker display mode
.RE
.PP
\fBWarning:\fP
.RS 4
In case of AlwaysOn, mouseTracking will be enabled for the observed widget. 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBtrackerMode()\fP, \fBDisplayMode\fP 
.RE
.PP

.SS "void QwtPicker::setTrackerPen (const QPen &pen)"Set the pen for the tracker
.PP
\fBParameters:\fP
.RS 4
\fIpen\fP Tracker pen 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBtrackerPen()\fP, \fBsetTrackerMode()\fP, \fBsetTrackerFont()\fP 
.RE
.PP

.SS "const \fBQwtPickerMachine\fP * QwtPicker::stateMachine () const"\fBReturns:\fP
.RS 4
Assigned state machine 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetStateMachine()\fP 
.RE
.PP

.SS "\fBQwtPickerMachine\fP * QwtPicker::stateMachine ()"\fBReturns:\fP
.RS 4
Assigned state machine 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetStateMachine()\fP 
.RE
.PP

.SS "void QwtPicker::stretchSelection (const QSize &oldSize, const QSize &newSize)\fC [protected, virtual]\fP"Scale the selection by the ratios of oldSize and newSize The \fBchanged()\fP signal is emitted.
.PP
\fBParameters:\fP
.RS 4
\fIoldSize\fP Previous size 
.br
\fInewSize\fP Current size
.RE
.PP
\fBSee also:\fP
.RS 4
\fBResizeMode\fP, \fBsetResizeMode()\fP, \fBresizeMode()\fP 
.RE
.PP

.SS "QFont QwtPicker::trackerFont () const"\fBReturns:\fP
.RS 4
Tracker font 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetTrackerFont()\fP, \fBtrackerMode()\fP, \fBtrackerPen()\fP 
.RE
.PP

.SS "\fBQwtPicker::DisplayMode\fP QwtPicker::trackerMode () const"\fBReturns:\fP
.RS 4
Tracker display mode 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetTrackerMode()\fP, \fBDisplayMode\fP 
.RE
.PP

.SS "QPen QwtPicker::trackerPen () const"\fBReturns:\fP
.RS 4
Tracker pen 
.RE
.PP
\fBSee also:\fP
.RS 4
\fBsetTrackerPen()\fP, \fBtrackerMode()\fP, \fBtrackerFont()\fP 
.RE
.PP

.SS "QPoint QwtPicker::trackerPosition () const"\fBReturns:\fP
.RS 4
Current position of the tracker 
.RE
.PP

.SS "QRect QwtPicker::trackerRect (const QFont &font) const\fC [virtual]\fP"Calculate the bounding rectangle for the tracker text from the current position of the tracker
.PP
\fBParameters:\fP
.RS 4
\fIfont\fP Font of the tracker text 
.RE
.PP
\fBReturns:\fP
.RS 4
Bounding rectangle of the tracker text
.RE
.PP
\fBSee also:\fP
.RS 4
\fBtrackerPosition()\fP 
.RE
.PP

.SS "\fBQwtText\fP QwtPicker::trackerText (const QPoint &pos) const\fC [virtual]\fP"
.PP
Return the label for a position. In case of HLineRubberBand the label is the value of the y position, in case of VLineRubberBand the value of the x position. Otherwise the label contains x and y position separated by a ',' .
.PP
The format for the string conversion is '%d'.
.PP
\fBParameters:\fP
.RS 4
\fIpos\fP Position 
.RE
.PP
\fBReturns:\fP
.RS 4
Converted position as string 
.RE
.PP

.PP
Reimplemented in \fBQwtPlotPicker\fP.
.SS "const QWidget * QwtPicker::trackerWidget () const\fC [protected]\fP"\fBReturns:\fP
.RS 4
Widget displaying the tracker text 
.RE
.PP

.SS "void QwtPicker::transition (const QEvent *e)\fC [protected, virtual]\fP"Passes an event to the state machine and executes the resulting commands. Append and Move commands use the current position of the cursor (QCursor::pos()).
.PP
\fBParameters:\fP
.RS 4
\fIe\fP Event 
.RE
.PP

.SS "void QwtPicker::updateDisplay ()\fC [protected, virtual]\fP"
.PP
Update the state of rubberband and tracker label. 
.SS "void QwtPicker::widgetEnterEvent (QEvent *event)\fC [protected, virtual]\fP"Handle a enter event for the observed widget.
.PP
\fBSee also:\fP
.RS 4
\fBeventFilter()\fP, \fBwidgetMousePressEvent()\fP, \fBwidgetMouseReleaseEvent()\fP, \fBwidgetMouseDoubleClickEvent()\fP, \fBwidgetWheelEvent()\fP, \fBwidgetKeyPressEvent()\fP, \fBwidgetKeyReleaseEvent()\fP 
.RE
.PP

.SS "void QwtPicker::widgetKeyPressEvent (QKeyEvent *ke)\fC [protected, virtual]\fP"Handle a key press event for the observed widget.
.PP
Selections can be completely done by the keyboard. The arrow keys move the cursor, the abort key aborts a selection. All other keys are handled by the current state machine.
.PP
\fBSee also:\fP
.RS 4
\fBeventFilter()\fP, \fBwidgetMousePressEvent()\fP, \fBwidgetMouseReleaseEvent()\fP, \fBwidgetMouseDoubleClickEvent()\fP, \fBwidgetMouseMoveEvent()\fP, \fBwidgetWheelEvent()\fP, \fBwidgetKeyReleaseEvent()\fP, \fBstateMachine()\fP, \fBQwtEventPattern::KeyPatternCode\fP 
.RE
.PP

.PP
Reimplemented in \fBQwtPlotZoomer\fP.
.SS "void QwtPicker::widgetKeyReleaseEvent (QKeyEvent *ke)\fC [protected, virtual]\fP"Handle a key release event for the observed widget.
.PP
Passes the event to the state machine.
.PP
\fBSee also:\fP
.RS 4
\fBeventFilter()\fP, \fBwidgetMousePressEvent()\fP, \fBwidgetMouseReleaseEvent()\fP, \fBwidgetMouseDoubleClickEvent()\fP, \fBwidgetMouseMoveEvent()\fP, \fBwidgetWheelEvent()\fP, \fBwidgetKeyPressEvent()\fP, \fBstateMachine()\fP 
.RE
.PP

.SS "void QwtPicker::widgetLeaveEvent (QEvent *event)\fC [protected, virtual]\fP"Handle a leave event for the observed widget.
.PP
\fBSee also:\fP
.RS 4
\fBeventFilter()\fP, \fBwidgetMousePressEvent()\fP, \fBwidgetMouseReleaseEvent()\fP, \fBwidgetMouseDoubleClickEvent()\fP, \fBwidgetWheelEvent()\fP, \fBwidgetKeyPressEvent()\fP, \fBwidgetKeyReleaseEvent()\fP 
.RE
.PP

.SS "void QwtPicker::widgetMouseDoubleClickEvent (QMouseEvent *me)\fC [protected, virtual]\fP"Handle mouse double click event for the observed widget.
.PP
Empty implementation, does nothing.
.PP
\fBSee also:\fP
.RS 4
\fBeventFilter()\fP, \fBwidgetMousePressEvent()\fP, \fBwidgetMouseReleaseEvent()\fP, \fBwidgetMouseMoveEvent()\fP, \fBwidgetWheelEvent()\fP, \fBwidgetKeyPressEvent()\fP, \fBwidgetKeyReleaseEvent()\fP 
.RE
.PP

.SS "void QwtPicker::widgetMouseMoveEvent (QMouseEvent *e)\fC [protected, virtual]\fP"Handle a mouse move event for the observed widget.
.PP
\fBSee also:\fP
.RS 4
\fBeventFilter()\fP, \fBwidgetMousePressEvent()\fP, \fBwidgetMouseReleaseEvent()\fP, \fBwidgetMouseDoubleClickEvent()\fP, \fBwidgetWheelEvent()\fP, \fBwidgetKeyPressEvent()\fP, \fBwidgetKeyReleaseEvent()\fP 
.RE
.PP

.SS "void QwtPicker::widgetMousePressEvent (QMouseEvent *e)\fC [protected, virtual]\fP"Handle a mouse press event for the observed widget.
.PP
\fBSee also:\fP
.RS 4
\fBeventFilter()\fP, \fBwidgetMouseReleaseEvent()\fP, \fBwidgetMouseDoubleClickEvent()\fP, \fBwidgetMouseMoveEvent()\fP, \fBwidgetWheelEvent()\fP, \fBwidgetKeyPressEvent()\fP, \fBwidgetKeyReleaseEvent()\fP 
.RE
.PP

.SS "void QwtPicker::widgetMouseReleaseEvent (QMouseEvent *e)\fC [protected, virtual]\fP"Handle a mouse relase event for the observed widget.
.PP
\fBSee also:\fP
.RS 4
\fBeventFilter()\fP, \fBwidgetMousePressEvent()\fP, \fBwidgetMouseDoubleClickEvent()\fP, \fBwidgetMouseMoveEvent()\fP, \fBwidgetWheelEvent()\fP, \fBwidgetKeyPressEvent()\fP, \fBwidgetKeyReleaseEvent()\fP 
.RE
.PP

.PP
Reimplemented in \fBQwtPlotZoomer\fP.
.SS "void QwtPicker::widgetWheelEvent (QWheelEvent *e)\fC [protected, virtual]\fP"Handle a wheel event for the observed widget.
.PP
Move the last point of the selection in case of \fBisActive()\fP == true
.PP
\fBSee also:\fP
.RS 4
\fBeventFilter()\fP, \fBwidgetMousePressEvent()\fP, \fBwidgetMouseReleaseEvent()\fP, \fBwidgetMouseDoubleClickEvent()\fP, \fBwidgetMouseMoveEvent()\fP, \fBwidgetKeyPressEvent()\fP, \fBwidgetKeyReleaseEvent()\fP 
.RE
.PP


.SH "Author"
.PP 
Generated automatically by Doxygen for Qwt User's Guide from the source code.
